Understanding Hydrogen Rich Superconductors: Importance of Effective Mass and Dirty Limit

Andrew L. Cornelius; Keith V. Lawler; Ashkan Salamat

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arXiv · 2202.04254

Understanding Hydrogen Rich Superconductors: Importance of Effective Mass and Dirty Limit

Andrew L. Cornelius·Keith V. Lawler·Ashkan Salamat

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Abstract

A class of hydrogen-rich (H-rich) systems, consistent with Type II superconductivity, are known to have very high superconducting transition temperatures Tc and upper critical magnetic field Bc2 values (up to 288 K and 222 T respectively). By looking at all the experimental H-rich superconductors reported to date most are in the dirty limit, with only the highest Tc values being in the crossover to the clean regime. In this framework, there is a clear understanding of some previous unexplained behaviors: (1) A maximum in Bc2 as a function of Tc; (2) a clear change in slope in Tc as a function of pressure in CSH; (3) in zero magnetic field the width of the superconducting transition decreasing with increasing Tc; and (4) in applied magnetic field the slope of the superconducting width versus field decreasing with increasing Tc. Ginzburg-Landau-Abrikosov-Gorkov (GLAG) theory is used to explain all four of these effects within a framework where increasing Tc is related to increases in both the electron effective mass and scattering length.

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Andrew L. Cornelius, Keith V. Lawler, Ashkan Salamat. 2022-02-09. Understanding Hydrogen Rich Superconductors: Importance of Effective Mass and Dirty Limit. https://arxiv.org/abs/2202.04254

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